Mixer



FIG. 1 is a perspective view of a mixer showing our new design;

FIG. 2 is a top plan view showing the new design;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a side elevation view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a front elevation view thereof. 

The ornamental design for a mixer, as shown and described. 